> ## Documentation Index
> Fetch the complete documentation index at: https://docs.crossmint.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Introduction

> Authenticate users and register customer identities for regulated activities

Crossmint provides two complementary capabilities for managing your users:

* **Identity** — Link a `userLocator` to additional customer information (KYC data, documents) required for regulated activities such as onramp, offramp, and payouts.
* **Auth** — Link a `userLocator` to an authentication system (Crossmint's built-in auth or your own). This lets users sign in, authorize API calls, and access Crossmint products.

Choose the path that matches your needs, or use both together.

<CardGroup cols={2}>
  <Card title="Get Started with Identity" icon="id-card" href="/identity/overview" />

  <Card title="Get Started with Auth" icon="user" href="/authentication/overview" />
</CardGroup>